<aside class="alert alert-warning" markdown="1">
  **SDK constraints and Dart 2 pre-releases:**
  The pub version solver in Dart 2 pre-releases can choose package versions that
  haven’t been verified to work with Dart 2.

  If you find a package that has Dart 2 issues,
  please report those issues immediately to the package maintainer,
  and let the Dart community know about any workarounds you find.
  For more information, see [Dart 2 Updates.](/dart-2)
</aside>
